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echo: os2prog
to: Mike Ruskai
from: Darin McBride
date: 1999-10-22 08:17:09
subject: HPFS freespace bmp list

 MR> What I'd like to do now is distribute the program that does this
 MR> comparison, to get a wider range of data.  Maybe HPFS386 doesn't have
this
 MR> problem, or a different version of HPFS, etc.

 MR> The problem is that I'm not certain how to handle drives larger than 4GB.
 MR> The freespace bitmap list is four sectors long, which allows for 512 data
 MR> bands (about 4GB).  Also in the HPFS SuperBlock is a pointer to a spare
 MR> freespace bitmap list.  What's not there is the length of this spare
list.
 MR> If it's only four sectors, like the primary list, then HPFS dies at 8GB,
 MR> without another list.

 MR> Unfortunately, I don't have any HPFS partitions larger than 4GB that I
can
 MR> poke around on.

Send me the source (dmcbride@tower.to.org), and I'll send you back its output
on my 7.99 GB HPFS drive. (8189MB)

The reason I ask for source is so I can convince myself you're not going to
damage my harddrive.  ;-)  Also, I assume you're using VAC 3.0 or gcc (EMX
0.9d) to compile it.

 MR> Does anyone know what the length of this secondary list is, or where to
 MR> find the next list, if it's only four sectors (and so on)?

Unfortunately, my system isn't quite big enough to show a >8GB disk... :-)


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